{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360021391864763392.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1117/1.jatis.10.1.015004"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Development of a near-infrared wide-field integral field unit by ultra-precision diamond cutting"}],"description":[{"notation":[{"@value":"Integral Field Spectroscopy (IFS) is an observational method to obtain spatially resolved spectra over a specific field of view (FoV) in a single exposure. In recent years, near-infrared IFS has gained importance in observing objects with strong dust attenuation or at high redshift. One limitation of existing near-infrared IFS instruments is their relatively small FoV, less than 100 arcsec$^2$, compared to optical instruments. Therefore, we have developed a near-infrared (0.9-2.5 $\\mathrm{\\mu}$m) image-slicer type integral field unit (IFU) with a larger FoV of 13.5 $\\times$ 10.4 arcsec$^2$ by matching a slice width to a typical seeing size of 0.4 arcsec. The IFU has a compact optical design utilizing off-axis ellipsoidal mirrors to reduce aberrations. Complex optical elements were fabricated using an ultra-precision cutting machine to achieve RMS surface roughness of less than 10 nm and a P-V shape error of less than 300 nm. The ultra-precision machining can also simplify alignment procedures. The on-sky performance evaluation confirmed that the image quality and the throughput of the IFU were as designed. In conclusion, we have successfully developed a compact IFU utilizing an ultra-precision cutting technique, almost fulfilling the requirements."}]},{"notation":[{"@value":"Comment: 24 pages, 18 figures, 7 tables. Accepted for publication in JATIS"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021391864763392","@type":"Researcher","foaf:name":[{"@value":"Masahiro Takeda"}],"jpcoar:affiliationName":[{"@value":"RIKEN, RIKEN Center for Advanced Photonics, Saitama, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391864763409","@type":"Researcher","foaf:name":[{"@value":"Yutaka Yamagata"}],"jpcoar:affiliationName":[{"@value":"RIKEN, RIKEN Center for Advanced Photonics, Saitama, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391864763396","@type":"Researcher","foaf:name":[{"@value":"Takuya Hosobata"}],"jpcoar:affiliationName":[{"@value":"RIKEN, RIKEN Center for Advanced Photonics, Saitama, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021391864763404","@type":"Researcher","foaf:name":[{"@value":"Kosuke Kushibiki"}],"jpcoar:affiliationName":[{"@value":"The University of Tokyo, Graduate School of Science, Institute of Astronomy, Tokyo, 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